Heard in concert, these giants of Persian music include tar (plucked lute) player Hossein Alizadeh, kamancheh (spiked fiddle) player Kayhan Kalhor, tombak (goblet drum) player and singer Homayoun Shajarian, and his father Mohammad Reza Shajarian, who has been called "a national treasure" and "the undisputed master of Persian traditional singing."

"Shajarian's singing is powerful and highly emotive, and he spans a surprisingly expansive range of registers. His soaring, plaintive ululations on 'Saz va Avaz Nahoft,' for example, cut straight to the heartstrings, as Alizadeh careers through octaves with consummate ease and flails furiously at his tar. But there is far more to the CD than Persian classical pyrotechnics and there are plenty of quiet moments that allow you to savor the intricacy of the instrumentalists' efforts."—Jerusalem Post

"Kalhor and Alizadeh have a rare synergy. Frequently trading off the melody in a call-and-response fashion, their playing seems less like a dialogue and more like a long-married couple finishing each other's sentences. The album's highest points, however, are the passages in which Homayoun Shajarian's voice joins that of his father. The two share the same remarkable qualities—both weighty and lyrical with an earth-shaking vibrato. Their shared passages not only sound like one voice accompanying itself, but often give the illusion of three or four vocalists. The results are both sonically and emotionally walloping."—Sing Out!